Fabricated dynamo-electric machine



Nov. 6, 1934. A, WOOD 1,980,026

FABRICATED DYNAMO ELECTRIC MACHINE Filed Feb. 24, 1954 I F1 2. l

Inventor: AXOJfidGT Wood His Attorney.

Patented Nov. 6, 19 34 e alize FABRICATED DYNAMO-ELECTRIC MACHINE Alexander P. Wood, Schenectady, N. Y., assignor to General Electric Company, a corporation of New York Application February 24, 1934, Serial No. 712,745

8 Claims.

My invention relates to fabricated dynamoelectric machines and particularly to an improved dovetail rib for securing laminations to a supporting member.

An object of my invention is to provide dovetail ribs for securing laminations to a supporting member of a dynamo-electric machine which may be readily formed from flat stock.

Further objects and advantages of my invention will become apparent as the following description proceeds, and the features of novelty which characterize my invention will be pointed out with particularity in the claims annexed to and forming a part of this specification.

For a better understanding of my invention,

reference may be had to the accompanying drawing, in which Fig. 1 is a side elevation partly broken away of the stationary member of a dynamo-electric machine embodying my invention;

Fig. 2 is an enlarged end elevation of a portion of the stationary member showing the dovetail ribs securing the laminations to the supporting frame; and Fig. 3 is an enlarged end view of a modified dovetail rib construction.

I have illustrated my invention applied to the stationary member of a dynamo-electric machine comprisin a supporting member or frame 1 having annular end plates 2 connected by inner ribs 3 and outer wrapping shells 4 and 5 and plates 13 which serve as supporting feet. An

annulus of laminations 5a, is arranged within the frame 1 and the laminations have notches 6 which are aligned transversely of the annulus. The laminations are secured to the supporting member by dovetails 7 engaging the notches 6 and attached to the frame 1.

In accordance with my invention, the dovetails 7 are preferably formed from a piece of fiat stool; in any suitable manner. The side walls or flanges 10 of the dovetail are spaced at the web 12 and extend outwardly from the web 12. The flanges have a portion 11 of wedge-shaped configuration extending inwardly to point 11a where the flanges are in contact to form an arch and'then flaring outwardly to engage the notches 6 in the laminations. The outwardly extending walls of the dovetail are spaced apart where they engage the notches in the laminations. The web 12 of the dovetail conforms to the shape of the supporting member and is secured thereto by welds at 8 and 9. By this construction a hollow dovetail can readily be made which is as strong as one made from solid stock and yet is considerably lighter and cheaper. The construction of the flanges 10 is such that they brace each other against both radial and tangential forces. In applying the rib construction shown in Fig. 2 to a machine, the flanges of the dovetail may be slid into the notches 6.

- The dovetail construction shown in Fig. 3 is -3 similar to that shown in Fig. 2, except for the shape of the flanges 15. These flanges are of wedge-shaped configuration extending inwardly from the opposite ends of the web 12 to form an arch and then flaring outwardly to engage the notches 6 in the laminations. Weld material is deposited at point 14 at the top of the arch and secures the flanges 15 together at this point. With this construction the flanges need not be in contact at the top of the arch, but may be spaced 7g slightly to allow the outside dimensions of the flared portions 15a of the flanges to be adjusted more accurately to the size of the notches 6 in the laminations. Flanges 15 brace each other and deflection of one of the flanges in a radial or 7 a tangential direction will be resisted by both of the flanges.

In assembling the rib shown in Fig. 3 into a dynamo-electric machine, part of the laminations my be slid on to one end of the rib. The flared portion 150. of the flanges 15 of the rib may then be forced apart into engagement with the notches 6 of the laminations by the insertion of a wedge at 14, and weld material may be deposited at 14 adjacent the laminations in order to hold the flanges in position and in tight engagement with the notches 6 or the laminations. Another group of laminations is then slid on the rib and forced against the first group of laminations, and in a like manner the flanges of the rib held in engagement with the notches in this group of laminations by another deposit of weld material at 14 adjacent this group of laminations. When the laminations are assembled in this manner, the welds are made at spaced points along the length of the rib. It is also possible to deposit the Weld material at 14 before the laminations are assembled on the rib. Moreover, the dovetails may be made with resilient flanges which can be compressed to allow the dovetail to be inserted in the 100 notches and which, when released, will be urged by the inherent resilience against the sides of the notches.

Although I have shown a particular embodi- 05 ment of my invention, I do not desire to be limited 1 to the construction described, and I intend in the appended claims to cover all modifications which do not depart from the spirit and scope of my invention. 11c

What I claim as new and desire to secure by Letters Patent of the United States, is:-

1. A fabricated dynamo-electric machine comprising a supporting member, laminations having their edges presented toward said supporting member and having notches therein, and means including a hollow dovetail having spaced side walls engaging said notches for securing said laminations to said supporting member.

2. A fabricated dynamo-electric machine commember and having notches therein, means including' a hollow dovetail having spaced side walls prising a supporting member, laminations having their edges presented toward said supporting member and having notches therein, and means including a hollow dovetail having spaced side walls each having an outwardly flaring portion engaging said notches for securing said laminations to said supporting member.

3. A fabricated dynamo-electric machine comprising a supporting member, laminations having their edges presented toward said supporting member and having notches therein, and a hollow dovetail having spaced side walls each having an outwardly flaring portion engaging said notches and having a web secured to said supporting member for securing said laminations to said supporting member.

4. A fabricated dynamo-electric machine comprising a supporting member, laminations having their edges presented toward said supporting member and having notches therein, and a hollow dovetail having spaced side walls each having a portion of wedge-shaped configuration with an outwardly flaring portion engaging said notches and havinga web secured to said supporting member for securing said laminations to said supporting member.

5. A fabricated dynamo-electric machine com- 7 prising a supporting member, laminations having their edges presented toward said supporting member and having notches therein, and means including a hollow dovetail having spaced side walls each having a portion of wedge-shaped configuration engaging said notches for securing said laminations to said supporting member.

6. A fabricated dynamo-electric machine comprising a supporting member, laminations having their edges presented toward said supporting each having a portion of wedge-shaped configuration'engaging said notches for securing said member and having notches therein, and means 05 7 including a hollow dovetail having spaced side walls each having a portion extending inwardly to form an arch and flaring outwardly therefrom to engage said notches for securingsaid lamina tions to said supporting member, said side Walls 114'? being secured together at the top of said arch.

' ALEXANDER P. WOOD. V 

